The authors thank the editor and reviewers of Information & Management for their constructive comments on this paper. This research is supported by a UGC GRF Grant (No. 717708) from the Hong Kong SAR Government, a Seeding Fund for Basic Research (No. 200911159142), and a seed Fund for Applied Research (No. 201002160030) from The University of Hong Kong. The authors also thank Professor Haijing Jiang for his valuable support to this project.

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NOTICE: this is the author’s version of a work that was accepted for publication in Information & Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Information & Management, 2011, v. 48 n. 7, p. 260-269. DOI: 10.1016/j.im.2011.06.003